Bones Don't Lie. Curtiss T. Gardner

A dead chemist and the sabotage of a steel mill's products come up against the determination of Ray Locke to clear himself, after a year in prison, of a framed charge. Who is the man who wrecked a train with a faulty axel? Successive «accidents» require the assistance of General Ulysses Grant Flint for their solution…and Ray keeps coming back to the steel mill, which seems to hold the key…